They're rumoured to be engaged with plans to wed this summer.
And whether or not the nuptial reports are true, Hayden Panettiere and Wladimir Klitschko couldn't have looked more in love as they enjoyed Easter on the beach in Miami over the weekend.
The pint-sized actress cuddled up to her rumoured fiancé as the couple alternated sunbathing with splashing around in the sea.
Hayden, 23, clung to her 6ft 6in tall beau and showered him with kisses as the pair put on a tender display of affection.
Following their dip in the sea, Hayden and Wladimir made their way back up the beach to join their friends.
But the pair's amorous displays didn't stop there, with Hayden continuing to cuddle up to her hunky partner, who appeared more than happy with the attention he was receiving from his pretty young girlfriend.
And it's no wonder the 37-year-old Ukranian struggled to tear his eyes away from Hayden, as the ton starlet ensured she was the centre of attention in a purple fringed bikini.
The two-piece featured a strapless fringed top and tiny bottoms with ties on the side, flattering Hayden's petite frame.
Clearly fully aware of how good she looked in her bikini, Hayden was at one point seen holding her arms out to the side, to give beach-goers the opportunity to admire her figure.
While Hayden left the majority of her belongings at home for her trip to the beach, she did accessorise her purple bikini with a large diamond ring.
And despite wearing the jewel on her right hand, there is some speculation that the glittering diamond could be Hayden's engagement ring.
Wladimir, meanwhile, displayed his muscular physique in a pair of low-slung denim-style swimming shorts.
The Scream 4 star and her boyfriend were joined on holiday by her three gal pals - Betsy Roo and Nashville musicians Kate York and Erin McCarley.
Hayden and Wladimir have yet to confirm or deny engagement rumours.
However, it was reported last month that Wladimir proposed to Hayden shortly after reconciling back in January - and now they're eager to walk down the aisle.
'Looks like a summer wedding!' a source close to the couple told Us Weekly.
The lovebirds, who first split in May 2011 after two years together, confirmed they were back together with a tender kiss at a Miami Heat game last month.
Hayden previously romanced Heroes costar Milo Ventimiglia and NFL player Scotty McKnight.
The actress can next be seen in the drama thriller, Over the Wall, with Oscar winner Melissa Leo and Six Feet Under star Freddy Rodríguez.
But until then, Hayden is working hard on her role as Juliette Barnes in the hit US TV show Nashville.